Hire a Fortune Teller or Tarot Card Reader
Halloween is an effective time to bring out the fortune tellers for a good cause. Use a fortune-telling station instead of or in addition to the classic pumpkin carving contest, apple dunk or autumn carnival. Set up a gypsy themed booth (or tent) with brightly colored banners, stars and half-moons, and sell fortunes. There are free software programs that teach Tarot Card reading if you're working on a tight budget, but if this is part of a large event, hire a professional fortune teller for the evening -- at a charity-friendly discount, of course.